Even with that said I wonder what Dureaus chances are of getting rid of the cancer again after Pongia had the tumoir removed late last year.

Jon Mannah was a similar thing

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It's pointless speculating about cancer. You can have 100 people with the exact same symptoms and the exact same treatment, and some will live and some will die, and if people knew why, they'd change the treatment to improve chances - which happens often.
In short, what happens with others doesn't mean much - it's the luck of the draw.